Fix Installed Config DIR

Replace the base directory of ISAAC with the prefix on install.
Before, the location of the (nested) CMake config package was taken,
which resulted in broken include paths (`<isaac.hpp>` can not be
found).

Author: ax3l

lib/CMakeLists.txt

@@ -6,8 +6,15 @@ configure_file (
 	"${PROJECT_BINARY_DIR}/ISAACConfigVersion.cmake"
 	@ONLY
 	)
+configure_file (
+    "${PROJECT_SOURCE_DIR}/ISAACBaseDir.cmake.in"
+    "${PROJECT_BINARY_DIR}/ISAACBaseDir.cmake"
+    @ONLY
+    )
 
 install( FILES "${CMAKE_CURRENT_SOURCE_DIR}/isaac.hpp" DESTINATION "include" )
 install( DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/isaac" DESTINATION "include" PATTERN "mainpage.dox" EXCLUDE )
 install( FILES "${CMAKE_CURRENT_SOURCE_DIR}/ISAACConfig.cmake" DESTINATION "lib/cmake/ISAAC" )
 install( FILES "${PROJECT_BINARY_DIR}/ISAACConfigVersion.cmake" DESTINATION "lib/cmake/ISAAC" )
+install( FILES "${PROJECT_BINARY_DIR}/ISAACBaseDir.cmake" DESTINATION "lib/cmake/ISAAC" )
+install( DIRECTORY "${CMAKE_CURRENT_SOURCE_DIR}/../Modules" DESTINATION "lib/cmake/ISAAC")

lib/ISAACBaseDir.cmake

@@ -0,0 +1,10 @@
+###############################################################################
+# INCLUDES
+###############################################################################
+set(ISAAC_INCLUDE_DIRS ${ISAAC_INCLUDE_DIRS} "${ISAAC_DIR}")
+set(ISAAC_INCLUDE_DIRS ${ISAAC_INCLUDE_DIRS} "${ISAAC_DIR}/isaac")
+
+###############################################################################
+# MODULES
+###############################################################################
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${ISAAC_DIR}/../Modules")

lib/ISAACBaseDir.cmake.in

@@ -0,0 +1,10 @@
+###############################################################################
+# INCLUDES
+###############################################################################
+set(ISAAC_INCLUDE_DIRS ${ISAAC_INCLUDE_DIRS} "@CMAKE_INSTALL_PREFIX@/include")
+set(ISAAC_INCLUDE_DIRS ${ISAAC_INCLUDE_DIRS} "@CMAKE_INSTALL_PREFIX@/include/isaac")
+
+###############################################################################
+# MODULES
+###############################################################################
+set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${CMAKE_CURRENT_LIST_DIR}/Modules")

lib/ISAACConfig.cmake

@@ -19,13 +19,7 @@
 cmake_minimum_required (VERSION 3.3.0)
 cmake_policy(SET CMP0048 OLD)
 
-set(ISAAC_INCLUDE_DIRS ${ISAAC_INCLUDE_DIRS} "${ISAAC_DIR}")
-set(ISAAC_INCLUDE_DIRS ${ISAAC_INCLUDE_DIRS} "${ISAAC_DIR}/isaac")
-
-###############################################################################
-# MODULES
-###############################################################################
-set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${ISAAC_DIR}/Modules")
+include("${CMAKE_CURRENT_LIST_DIR}/ISAACBaseDir.cmake")
 
 ###############################################################################
 # OPTIONS